Roger,
As SteveINWA mentions, Google Voice is not intended for business use and I would not recommend GV for use as a telephony system for a church.
If you decide to go with the OBi202's, I suggest that you take a look at
voip.ms.
https://voip.ms/Voip.ms has a strong feature sets allowing numerous configuration options, reasonal rates and twenty five DID POPs in twelve major US cities. Also seven DID POPs in Canada and three in Europe.
I have found service on
voip.ms to be very dependable and the features fun to play with.
The following is copied from the
voip.ms web site.
DID Routing
SIP, IAX, SIP URI
Ring Group
Call Forwarding
Callback
Failover
Voicemail
Digital Receptionist
Calling Queues
Recording
Time Condition
DISA
Free/Unlimited Support Tickets and Live Chat
Clear, no-nonsense, simple to understand billing
All features included by default/available to all accounts
Use your own device, soft phone, Asterisk, PBX or switch
6 seconds billing increment
USA 48 Premium tier-1 @ 1¢ per minute ($0.01)
Canada starting as low as ½ ¢ per minute ($0.0052)
Canada Premium tier-1 @ 1¢ per minute ($0.01)
Free calls between
VoIP.ms DID's
Free iNum Origination and Termination
Full SIP Broker support
Keep your number:
VoIP.ms offers number portability
Connect as many phones as you wish with sub-accounts
Free calls to Toll-Free numbers (Termination)
Premium Quality Domestic and Toll free DIDs
International DIDs in over 30 countries
High Channel-Capacity DID's from $0.99 per month
Inbound calls from $0.01 / Toll free: $0.019
CNAM, Voicemail, e411, e911, Speed Dial and SIP URI's
True Canadian CNAM Pass-through (In/Out)
Digital Receptionist (IVR), Recordings, Calling Queues
Ring Groups, Callback, Failover destination, Call Forwarding
Detailed CDR also available in xls, csv, sql and xml
A to Z call termination (Worldwide Call Termination)
No volume commitment
Pay as you go pricing scheme
Very competitive rates
Customer support staff available via Live Chat
Free Asterisk Configuration support
Support available in English, French and Spanish
Flexible Dialing Rules